The phenomenon of black hole evaporation has astonished the world of science for quite some time. This marvelous phenomenon is also known as the Hawking radiation or the thermal radiation  [1]}. There has been a vast study to explore this phenomenon for different spacetimes such as for eternal black holes, Rindler or a non-extremal black hole background where the particle creation do occurs in causally disconnected spacetime wedges and also for uniformly accelerated or Rindler observers in flat spacetimes known as the Unruh effect [2]} etc. We refer our reader to [3]}, [4]}, [5]}, [6]}, [7]}, [8]}, [9]} for an extensive review on these outlooks. The thermal radiation can be collected in terms of entanglement entropy. As the black hole gets hotter it creates more thermal particle or increase more randomness, hence entanglement entropy monotonically increase without a bound but at the end of the evaporation entanglement entropy must go to zero for an evaporating black hole since state of black hole is a pure state. Therefore, this creates the problem of information paradox [10]}.
